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This investigation reports on the growth of this bacterial species on the …


Biology Articles » Geobiology » The effect of adsorbed lipid on pyrite oxidation under biotic conditions » Summary

Summary
- The effect of adsorbed lipid on pyrite oxidation under biotic conditions

The amount of pyrite oxidation in the presence of bacteria and with an adsorbed phosphocholine layer has been investigated. The presence of A. ferrooxidans greatly increases the amount of pyrite oxidation relative to the bacteria-free system. Pretreatment of pyrite with the phosphocholine lipid reduces its oxidation rate compared to untreated pyrite. By measuring the density of surface bound and solution bacteria it was determined that under our experimental conditions the amount of pyrite oxidation is more a function of the surface-colonized bacteria concentration than the solution bacterial fraction. Our results also show that the lipid oxidation barrier layers are stable in the presence of A. ferrooxidans for at least 25 days under our experimental conditions. A separate study will be conducted to evaluate the fate of the surface-bound lipids in the presence of heterotrophic bacteria.

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